Emphasize
Part of speech: verb
Definition: To stress, give emphasis or extra weight to (something).
Example sentence: On stage you need to emphasize every emotion. But on screen you need to tone everything down and make it believable.
Underline
Part of speech: verb
Definition: To draw a line underneath something, especially to add emphasis; to underscoreTo emphasise or stress something
Part of speech: noun
Definition: A line placed underneath a piece of text in order to provide emphasis or to indicate that it should be viewed in italics or that it acts as a hyperlinkAn character